“But despite the benefits that the LLC topology can offer, including minimal standby power and low audible noise, electric vehicle manufacturers have been hesitant to use the LLC topology because the limited operating input voltage range – automotive dc-dc converters need a wide input, output voltage support, or both, in order to maintain performance during cold-crank, transient or crash-related events,” according to the company. “Technological innovations in LLC controllers are enabling new use cases for the LLC topology in automotive charging applications.”
Called UCC25661x-Q1, the ICs operate across 50 to 750kHz at full-load, and implement ‘input-power proportional control’ (IPPC), a novel analogue-based feed-forward scheme which reduces the control signal’s dependency on switching frequency, thereby minimising the impact of input and output voltage variations.
“IPPC widens the control range of the LLC converter and simplifies the design of wide input applications such as high voltage to low voltage redundant auxiliary, key-off or bias isolated power supplies,” said TI. “IPPC also simplifies the design of wide output applications such as light electric vehicle chargers for scooters, mopeds, golf carts and fork lifts.”

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